Ignoring Eclipse IDE metadata information
Added another <pluginExecution> tag to deal with the
org.codehaus.mojo:build-helper-maven-plugin causing issues when project
is built using M2Eclipse plugin.

Actual error message seen was "Plugin execution not covered by lifecycle
configuration:
org.codehaus.mojo:build-helper-maven-plugin:1.8:add-source (execution:
add-source, phase: generate-sources)"